TPS54231
SLUS851–OCTOBER 2008.............................................................................................................................................................................................. www.ti.com
TYPICAL CHARACTERISTICS (continued)
MINIMUM CONTROLLABLE ON
MINIMUM CONTROLLABLE DUTY
VOLTAGE REFERENCE
vs
JUNCTION TEMPERATURE
TIME
RATIO
vs
vs
JUNCTION TEMPERATURE
JUNCTION TEMPERATURE
7.50
7.25
0.8240
0.8180
140
130
VIN = 12 V
VIN = 12 V
0.8120
7
6.75
6.50
6.25
6
0.8060
0.8000
120
110
100
0.7940
0.7880
0.7820
0.7760
5.75
5.50
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
TJ - Junction Temperature - °C
TJ - Junction Temperature - °C
TJ - Junction Temperature - °C
Figure 4.
Figure 5.
Figure 6.
SS CHARGE CURRENT
vs
JUNCTION TEMPERATURE
CURRENT LIMIT THRESHOLD
vs
INPUT VOLTAGE
4
2.10
TJ = 25°C
TJ = -40°C
2
3.5
TJ = 150°C
1.90
3
-50
-25
0
25
50
75
100
125
150
3
8
13
18
23
28
TJ - Junction Temperature - °C
VI - Input Voltage - V
Figure 7.
Figure 8.
SUPPLEMENTAL APPLICATION CURVES
TYPICAL MINIMUM OUTPUT
TYPICAL MAXIMUM OUTPUT
VOLTAGE
vs
VOLTAGE
vs
MAXIMUM POWER DISSIPATION
vs
INPUT VOLTAGE
INPUT VOLTAGE
JUNCTION TEMPERATURE
1.25
1.15
1.05
0.95
30
25
20
15
150
125
IO = 1 A
100
75
IO = 1 A
IO = 2 A
IO = 2 A
10
5
0.85
0.75
50
0
25
3
8
13
18
23
28
3
8
13
18
23
28
0
0.2
0.4
PD
0.6
0.8
1
1.2
VI - Input Volatage - V
VI - Input Voltage - V
-
Power Dissipation - W
Figure 9.
Figure 10.
Figure 11.
6
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